thingler / esp32-pico-module

Thingler ESP32-PICO Module

Thingler ESP32-PICO Module

Thingler ESP32-PICO Module is a small size ESP32 development board with a minimum of required external components (including antenna). It's in the size of 20.60 mm x 15.60 mm with 16 pins and can be placed on a breadboard for prototyping. The module can be powered and programmed with the Thingler ESP32 Programmer but can also be powered with a separate power supply for small-sized designs.

Thingler ESP32 Programmer schematics and PCB has been designed with KiCad.

Getting started

Requirements

• KiCad for the schematics

• Thingler ESP32 Programmer

Pin configuration

Due to the size of the module, only part of the pins from the ESP32 microcontroller is exposed. Many of the ESP32 features can be configured to any of the I/O pins but some considerations has been made during the design of the module. Sice the ADC2 is shared with the WIFI module, which has higher priority, reading operation of adc2_get_raw() will fail between esp_wifi_start() and esp_wifi_stop(). Hence, three ADC1 channels have been exposed from the module in order to read ADC conversions during WIFI operation. Pins for I2S and DAC has also been exposed from the module.

Thingler ESP32-PICO Module has the following pin configuration:

Name	Microcontroller pin(s)	Type	Function
3V3	1, 3, 4, 19, 37, 43, 46	P	Analog power supply (2.3V ~ 3.6V)
GND	49	P	Analog power supply (ground)
IO0	23	I/O	ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK
EN	9	I	High: On; enables the module, Low: Off; resets the module
RXD0	40	I/O	GPIO3, U0RXD, CLK_OUT2
TXD0	41	I/O	GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2
IO33	13	I/O	32K_XN (32.768 kHz crystal oscillator output), ADC1_CH5, TOUCH8, RTC_GPIO8
IO32	12	I/O	32K_XP (32.768 kHz crystal oscillator input), ADC1_CH4, TOUCH9, RTC_GPIO9
IO25	14	I/O	GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
IO26	15	I/O	GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
IO37	6	I	GPIO37, ADC1_CH1, RTC_GPIO1
IO20	27	I/O	GPIO20
IO10	29	I/O	GPIO10, SD_DATA3, HS1_DATA3, U1TXD
IO7	32	I/O	GPIO7, SD_DATA0, HS1_DATA0, U2RTS
IO8	33	I/O	GPIO8, SD_DATA1, HS1_DATA1, U2CTS
IO5	34	I/O	GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK

Build

The PCB wihout components can be ordered from Aisler or the PCB can be ordered from any fabrication houses by providing the gerber files.

The following components has been used for the module:

Ref	Qty	Manufacturer Part Number	Manufacturer	Description	Product Link
U1	1	ESP32-PICO-V3	Espressif Systems	RF System on a Chip - SoC SIP module ESP32 with 4MByte Flash, Dual Core MCU, Wi-Fi & Bluetooth Combo, LGA48-pin, 7*7mm	Mouser
J1, J2	2	10129378-908002BLF	Amphenol FCI	Headers & Wire Housings ECONOSTIK HEADER SR VT TH 1X8	Mouser
AE1	1	2450AT14A0100T	Johanson Technology	Antennas SMALL AREA 2.4G ANT	Mouser
C1	1	CGA4J1X7R0J106K125AC	TDK	10 uF 10% 0805 6.3V	Mouser
C2, C4	2	885012207098	Wurth Elektronik	100 nF 10% 0805 50V	Mouser
R1	1	CRCW080510K0FKEAC	Vishay / Dale	Thick Film Resistors - SMD 1/8Watt 10Kohms 1% Commercial Use	Mouser

License

Released under GNU/GPL Version 3

esp32-pico-module's Issues

Question about PCB

Hello, Firs of all thankyou for your efforts i will try to make this module and fabricate it to do that in order to maintain the best performance for the antenna i noticed you did not make a ground plane
1 - do i have to make a ground plane ?
2 - what is the pcb thickness from wihch you calculated the wire width attached to the antenna via the capacitor to achieve 50ohm of impedance
3 - can you please tell me if the results of your antenna is good ?
4 - can i replace your antenna with chip antenna ?

Thank you very much